A search for a long-lived scalar particle. is performed looking for the decay B+ -> K+chi with chi ->mu(+)mu(-) pp collision data corresponding to an integrated luminosity of 3 fb(-1) collected by the LHCb experiment at center-of-mass energies of root s = 7, 8 TeV. This new scalar particle predicted by hidden sector models is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass 250 < m(chi) < 4700 MeV/c(2), lifetime 0.1 < tau(chi) < 1000 ps. Upper limits on the branching fraction B(B-broken vertical bar -> K-broken vertical bar chi(mu(vertical bar) mu(-))) at 95\% confidence level are set as a function of m(chi), tau(chi) varying between 2 x 10(-10) 10(-7). These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.

Search for long-lived scalar particles in B+-> K+chi(mu(+) mu(-)) decays

Bonivento W.;Bursche A.;Chen S.;Cogoni V.;Dettori F.;Manca G.;Oldeman R.;Saitta B.;
2017-01-01

Abstract

A search for a long-lived scalar particle. is performed looking for the decay B+ -> K+chi with chi ->mu(+)mu(-) pp collision data corresponding to an integrated luminosity of 3 fb(-1) collected by the LHCb experiment at center-of-mass energies of root s = 7, 8 TeV. This new scalar particle predicted by hidden sector models is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass 250 < m(chi) < 4700 MeV/c(2), lifetime 0.1 < tau(chi) < 1000 ps. Upper limits on the branching fraction B(B-broken vertical bar -> K-broken vertical bar chi(mu(vertical bar) mu(-))) at 95\% confidence level are set as a function of m(chi), tau(chi) varying between 2 x 10(-10) 10(-7). These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/240125
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